My Left hand fan was roaring like a beast every time I would start it up.
The repair was extremely easy.
The hardest parts were the wait, getting the keyboard off from around the track pad, followed by disconnecting the iSight connector.
My laptop is understandably getting older now, but since I've left AppleCare but still wanted to continue using my laptop I decided to try and do this repair myself. Looking around at the other guides and looking at how the insides of my computer, I'm confident about keeping my battle scarred laptop around for quite some time.
After putting everything back together the fan runs wonderfully. The silence is awesome!